add

verb

Pronunciation: /æd/

Initialism of attention deficit disorder.
Initialism of accidental death and dismemberment.
“Although not sought by QuesTech, the dismemberment portion of the policy was nonetheless issued as an integral part of Hartford’s standard ADD policy.”
“ADD Insurance: Also known as Accidental Death and Dismemberment policy, […]”
A designation on prerecorded compact discs indicating that the contents were recorded in analog but mixed and mastered in digital.

Etymology: From Middle English adden, from Latin addō (“add, give unto”).

To join or unite (e.g. one thing to another, or as several particulars) so as to increase the number, augment the quantity, or enlarge the magnitude, or so as to form into one aggregate.
To sum up; to put together mentally; to add up.
“to add numbers”
“[…]as easily as he can add together the ideas of two days or two years.”
To combine elements of (something) into one quantity.
“to add a column of numbers”
To give by way of increased possession (to someone); to bestow (on).
“The Lord shall add to me another son.”
“Back to thy punishment, False fugitive, and to thy speed add wings.”
To append (e.g. a statement); to say further information.
“He added that he would willingly consent to the entire abolition of the tax”
“"Bless your dear heart," she said, "I am sure I can tell you of a way to get back to Kansas." Then she added, "But, if I do, you must give me the Golden Cap."”
To intensify; to augment; to increase.
“It adds to our anxiety.”
“I will add to your yoke”
To perform the arithmetical operation of addition.
“He adds rapidly.”
To summon minions or reinforcements.
“Typically, a hostile mob will add whenever it's within the aggro radius of a player.”
To add someone as a friend.